20 THE UNIVERSITY SCIENCE BULLETIN. 
Such a catastrophe did not disturb the Gelastocorids, for they 
were out again as soon as the waters sufficiently receded. 
(Plate II shows a photograph of a western Kansas river.) 
Eastern Kansas. 
Collections were made in the pools and ponds about Law- 
rence. Lake View, the largest standing body of water avail- 
able, is six miles from the city. This occupies an abandoned 
channel of the Kaw river, and is, in fact, an ‘“‘oxbow’’ lake. 
This strip of water is perhaps 150 yards across and a mile long, 
fringed by willows along the sides and encroached upon at the 
ends by cattail, scouring rush and other plants. A thorough 
survey has never been made of this place. 
Haskell Pond: An artificial pond covering perhaps half an 
acre. This pond has a muddy bottom and little vegetation. It 
is fed by the runoff of the land and by a little intermittent 
stream that has its origin in some springy ground in a mow- 
land meadow above the pond. This stream, a mere ditch, over- 
grown by tall marsh grass, contains several water holes that 
have been good collecting for water bugs, especially for Belo- 
stoma. 
Griesa Pond: A little dammed-up pool of very muddy water, 
in extent perhaps, three rods long and two broad. This is lo- 
cated in a five-acre lot and invaded by two or three cows in fly 
time. Since the bottom consists of deep, fine silt these visita- 
tions keep it ever turbid and filthy. It was in this pond that 
the Ramphocorixa and the egg-burdened crayfish were most 
abundant. 
Smith Pond: Of the same type as above, but less muddy, 
being located in a pasture and so situated as to receive less 
silt. It is more than three times the size of the Griesa pool, 
and perhaps four feet in its deepest part. There are no seed 
plants growing in the pool. Unicellular alge make its waters 
green in midsummer. Entomostraca became exceedingly abun- 
dant here one dry summer, and the pond was teeming with 
thousands of the back-swimmers of the genus Buenoa. 
The Quarry Pools: Two temporary pools, occupying depres- 
sions where limestone had been quarried, were visited one 
season almost daily from earliest spring until they disappeared. 
The two pools were quite different. One named the Cattail 
pool was surrounded by cattail. Its waters were clear and 
ee 
